If you don't mind the postage, send it to me and I'll clean it up for you. No guarantees, but I've cleaned and resurrected plenty of boards that looked worse...I also have an RX100 to use as a reference.
That is very kind of you. I will indeed gladly pay the postage if you are willing to give the camera a shot. If you could PM or email me your postal address the camera could soon be on its way. Should you not succeed, than you will have a few spare parts for your RX100.